Year	Percent
1995	53.44
1996	51
1997	55.2
1998	52.06
1999	51.45
2000	48.79
2001	41.93
2002	44.54
2003	41.59
2004	42.61
2005	46.65
2006	39.95
2007	33.6
2008	29.9
2009	25.7
2010	23.76